Please try these fixes if your are having issues with lag a stuttering in game! Please do not message me until you have. If you do your not gonna like my response. Cheers thx and GG

Adding the following command line arguments to the game's launch options.

-high -useallavailablecores - These commands maximize Ark's CPU usage. They can increase FPS by as much as 30% with no loss of visual quality.

-sm4 -dx10 - These commands force the use of Shader Model 4.0 and DirectX 10 instead of Shader Model 5.0 and DirectX 11. It has a dramatic effect on performance, i.e. raising FPS from ~40 to ~100, but also lowers the game's visual quality by a noticeable degree.

-lowmemory - This setting forces Ark to run in low memory mode, using only 4gb of RAM. This can improve performance in systems with less than 16gb of RAM.

In the in-game menu, the setting that seems to have the greatest effect on performance is shadows. Reducing shadows from Epic to Low can increase frame rate by more than 50%.